The coin is a nice example of the variety. I am a fan of the Lincoln cents with doubled or tripled mint marks. They are reasonably priced and it is an error that is visible usually with the naked eye. I've thought about starting a collection of these RPMs. Maybe that will be my venture in 2017.
Actually, this was in an old 1976 coin holder plaque for lincolns that my son-in-law gave me for Christmas . He picked it and a couple other ones up at an antique store for $15 per plaque. One had some decent toned wartime nickels. I think he did good.